Explosive.



- safety-powders.

, ized and mixed by Uurrnn @EATES CORPORATION OF NEW JERSEY.

PATENT orrron i.

AREJASSIGNOR TO THE E. I. DU PONT WILMINGTON, DELAWARE, A'

EXPLOSWE Specification of Letters latent.

latented April 16, 1907.

Application filed February 8, 1906. Serial No. 300391.

To (Ll-Z whom it may concern:

Be it known that I, FIN 'SPARRE, a subject of the King of Norway, residing-at Wilmington, county of Newcastle, and State of Delaware, have invented a new and useful Improvement in Explosives, of which the following is a full, clear, and exact description.

The object of my invention is to produce an explosive ble of acting as an effective substitute for the lower grades of dynamite, but having the advantage over dynamite of being safer and non-freezing. My explosive consists, preferably, of the following; ingredients: nitrocellulose, ammonium nitrate, a metallic ingredient; such as ferrosilieon or iron pyrites, sodium or potassium nitrate, and sulfur and charcoal or kerosene. Both the sodium nitrate and the potassium nitrate may be employed, one being the equivalent of the other, in my composition.

The following composition illustrates my invention and the proportions of the several ingredients:

Nitrocellulose. I Ferrusllicon Ammonium nitrate.

Sodium nitrate Polmsuuu nitrate to 20 per cent preferably per cent. 5 to '21) per cent, preferably 10 per cent. to 7.5 per cent, preferably 40 per cent. 10 to 50 per cent, preferably 30 per cent. Sulfur v 2 to 8 per cent., preferably 4 per cent. Charcoal. 0 to. 8 per cent, preferably 3 per cent. kerosene U tn per cent, preferably 3 per cent.

suitable for blasting and capa-.

l l l I l l l The foregoing ingredients are preferably incorporated in the ordinary way of making I The simplest way of incorporating the ingredients is to place the ingredients in the described proportions while in a dry state in a rolling-null or pulverizing-bar rel such as is commonly employed in the manufacture of both black powder and safety-powders, the materials being pulverthe action of the machine for approximately three hours.

l l l i l l l The proportion of ammonium nitrate may be substantially decreased, and, indeed, it may be omitted altogether. if ammonium nitrate be omitted or its proportion substantially decreased, the proportion of nitrocellu-v lose and also the proportion of sodium nitrate or potassium nitrate should be substantially increased.

The following is an exampleof a composition with ammonium nitrate omitte Nitrocellulose r to (50 per cent., preferably 3U-bcr cent. Ferrusillcun. 5 to per cent., preferably ll per cent. sndium to 70 per cent, preferably 52 percent.

Potassium nitrate.

2 to 10 per ccntl, preferably 3 per cent.

Sulfur Charcoal 9 to 10 per cent, preferably 4 per cent.

Having now fully described my invention, what 1 claim, and desire to protect by Let tel's Patent, is-- 1. An explosive composition vcontaining nitrocellulose, fcrrosilicon, sodium nitrate and sulfur in substantially the described proportions.

2. An explosive composition containing nitrocellulose, ferr'osilicon and sodium nitrate in substantially the described proportions.

3. An explosive composition containing.

nitrocellulose, ferrosilicon, sodium nitrate, sulfur and charcoal in substantially the described proportions.

4. An explosive composition containing nitrocellulose, ferrosilicon, sodium nitrate,

ammonium nitrate, sulfur and charcoal in substantially the described proportipns.

In testimony of which invention I have hereunto set my hand, at l/Vihn'ington, on thislst day of February, 1906.

FIN SPARRE.

l/Vitnesses CHARLES G. Goran, ALVIN B. RonEnsoN. 

